Fail-Safe CPU and signal module (SM) installation
4.3 Control system wiring guidelines
S7-1200 Functional Safety Manual
98 Manual, 02/2015, A5E03470344-AA
Control system wiring guidelines
4.3.1
Guidelines for grounding and wiring
Proper grounding and wiring of all electrical equipment is important to provide electrical
noise protection for your application and the S7-1200. Refer to the technical specifications
(Page 132) for the S7-1200 wiring diagrams.
Before you ground or install wiring to any electrical device, ensure that the power to that
equipment has been turned off. Also, ensure that the power to any related equipment has
been turned off.
Ensure that you follow all applicable electrical codes when wiring the S7-1200 and related
equipment. Install and operate all equipment according to all applicable national and local
standards. Contact your local authorities to determine which codes and standards apply to
your specific case.
Installing or wiring the S7-1200 or related equipment with power applied could cause
electric shock or unexpected operation of equipment.
Failure to disable all power to the S7-1200 and related equipment during installation or
removal procedures could result in death, severe personal injury, and damage due to
electric shock or unexpected equipment operation.
Always follow appropriate safety precautions and ensure that power to the S7-1200 is
disabled before attempting to install or remove the S7-1200 or related equipment.
Always take safety into consideration as you design the grounding and wiring of your S7-
1200 system. Electronic control devices, such as the S7-1200, can fail and cause
unexpected operation of the equipment that is being controlled or monitored:
● On-board I/O on the fail-safe CPU and signal modules (SM) other than fail-safe SM:
Single point dangerous failures of electronics or software can occur on these devices.
You should never depend on these devices as the only protection against personal injury
or unacceptable property damage.
● Fail-safe SM: Internal dangerous failures can occur on these devices with a probability as
reflected in the SIL rating, PFD, and PFH as stated in this manual.
● Each control's installation: Common cause failure threats can occur such as overvoltage,
over-temperature, electrical faults, EMC interference, and fire, water, or mechanical
damage to the installation.
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